An oil cooling structure of an engine is provided that is capable of enhancing cooling performance of oil while preventing an increase in number of components or an increase in required space from being involved as much as possible. In an oil cooling structure of an engine in which a transmission case is attached to one end wall of an engine body, and a transmission mechanism for an accessory drive is provided in the transmission case, the transmission case is formed into a potlid-shaped body having a plurality of rib walls along a front-rear direction, and is attached to an engine front wall with an engine cooling fan, and case inner chamber portions partitioned by the rib walls in the transmission case are configured as a transporting passage of oil circulated by an oil pump.

The present disclosure improves serviceability of an automotive powertrain unit without deteriorating NVH characteristics. A powertrain includes an engine having a cylinder head; and a transmission coupled to the engine. The engine includes an EGR connected between an intake passage and an exhaust passage. The transmission is provided below the cylinder head in a vehicle height direction. The EGR is provided along a side of the cylinder head toward the transmission, and supported by the transmission.

A case for an endless transmission member includes a first case member attached to a vehicle-mounted internal combustion engine and a second case member attached to the first case member. The first and second case members define an accommodation chamber that accommodates an endless transmission member looped over rotating bodies of the engine. The first case member includes a communication hole that connects the accommodation chamber to the inside of the engine. The first or second case member includes a guide rib that guides lubricant from the accommodation chamber to the inside of the engine. In an orientation of the case when the engine is installed in a vehicle, the guide rib is provided along part of the lower side of the opening edge of the communication hole including the lower end of the opening edge.

A seal structure for an internal combustion engine comprising: a cover side seal member which extends on upper surface sides or lower surface sides of both of an engine main body section and a chain casing and pressed and held against a cover member; a casing side seal member arranged at left or right end section of one end surfaces of the engine main body section onto which the chain casing is attached and pressed and held against the chain casing; a receiving concavity formed to extend on a junction surface of the chain casing to the cover member; and an extremely thick connection block section formed integrally on one end section of the casing side seal member, fitted into and retained by the receiving concavity, and projected more toward the cover member side than a junction surface of the chain casing to the cover member in a free state.

A cover for an automobile engine covers a crank pulley and an auxiliary drive belt of an engine arranged in an engine room with the crank pulley and the auxiliary drive belt being in a posture facing a front direction of a vehicle body. The cover includes a reinforcing body that includes a fastening part attaching to the engine and is integrated with a sound-absorbing main body.

Provided is a resin cover removal structure for removing a resin cover attached to a metallic body, where the body and the resin cover are attached to each other in such a manner that a body-side attachment surface formed on a peripheral edge portion of the body and a cover-side attachment surface formed on a peripheral edge portion of the resin cover face each other, a part of at least one of the body-side attachment surface and the cover-side attachment surface is cut off to provide an insertion groove opened outside a peripheral edge portion thereof, the insertion groove is inclined in such a manner that a distance between the body and the resin cover decreases toward the inside of the peripheral edge portion, and the resin cover can be removed from the body by inserting a wedge-shaped tool into the insertion groove.

A support structure for a crankshaft includes a crankshaft that is rotatably supported on a cylinder block of an internal combustion engine and has an end portion protruding from the cylinder block, a sprocket that is attached on the end portion protruding from the cylinder block and is connected to a cam shaft, a pulley that is attached on the end portion on an opposite side from the sprocket with respect to the cylinder block and is connected to an auxiliary apparatus, and an end bearing that rotatably supports the end portion relative to the cylinder block and is provided on the end portion between the sprocket and the pulley.

A cover for an internal combustion engine is configured to be attached to an engine main body so as to cover a timing chain or a timing belt. The cover for the internal combustion engine includes insertion holes configured to receive a crankshaft or a camshaft. The cover for the internal combustion engine includes a first member made of a hard plastic and a second member made of a material different from the hard plastic. The first member is produced by insert molding with the second member embedded in the first member. A periphery of at least one of the insertion holes in the second member includes a joint surface that is joined to the first member. The joint surface includes annular grooves surrounding the insertion hole, the annular grooves being arranged in a radial direction of the insertion hole.

The overhead camshaft engine (10) includes a cylinder block (11), a crankcase (12) attached to a lower part of the cylinder block to define a crankcase chamber (32), a bearing retaining member (60) attached to a part of the cylinder block, a crankshaft (20) rotatably supported by a pair of bearings (21, 22) supported by the cylinder block and the bearing retaining member, respectively, and a crankshaft pulley (53) attached to a part of the end of the crankshaft projecting outward from the bearing supported by the bearing retaining member.

A case that houses a chain includes a first cover member fixed to a cylinder block and a cylinder head, and a second cover member arranged on the opposite side of the cylinder block and the cylinder head from the first cover member. In an intermediate part, which is a part of a confronting wall of the first cover member between the first flange and the second flange, a cover-side rib is provided, having a height so that a distal end of the cover-side rib is not in contact with the cylinder block.